The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed.
A star is mainly made of hydrogen gas, but most classes of stars include other elements such as helium, calcium, and other heavier elements and molecules.
Group of answer choices
True
False
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Mendeleev placed thallium (Tl) in the same group as lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). However, the modern periodic table doesn’t place thallium in this group. Use the periodic table to find the properties of thallium. Explain why Mendeleev might have grouped thallium in the same group as lithium and sodium. Also explain how thallium is different from the other five elements.
Answer:
When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly
Explanation:
Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.
Mendeleev might have grouped thallium in the same group as lithium and sodium due to many reasons:
Since, all are metals so they need to be placed in the same group.The particular group is referred to (group one) is actually the most reactive metals on the periodic table. These are the elements that most easily loose their electron from their outer valence shell. Thus each element can easily give up their valence electron in a reaction to form a positive ion. These are the most easily reactive in this way.When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly.Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.
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At 1 atmosphere and 20 degrees Celsius, all samples of H20(l) must have the same
A)volume B) mass C) density D) weight
(Explain)
Answer:
nice
Explanation:
one
At 1 atmosphere and 20 degrees Celsius, all samples of H₂0(l) must have the same density.
What is ideal gas equation?Ideal gas equation of gases gives idea about the behavior of gases at different conditions and it will be represented as:
PV = nRT, where
P = pressure
V = volume
n = moles
R = universal gas constant
T = temperature
After rearranging the equation, we get
P/RT = n/V
Quantities which are present on the left side all are constant and the value on the right side describes the density of the water.
Hence they must have same density.
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please help! will give brainliest!!! match each of the terms on the right with the letters on the right.
Answer:
Metal -c
Explanation:
answer me
short answer
Explanation:
B. 1) Tritium is the isotope of Hydrogen (H).
2) Mass of an Electron is 9.10938356 × 10-³¹ Kg.
3) Molecular mass of Carbon dioxide (CO2)
=> Molecular mass of carbon = 12g
Molecular mass of oxygen= 16g
molecular mass of CO2 = [12 + (16 X 2)]g
= (12 + 32)g
= 44 g
4) Dalton has given its Atomic Theory in the year 1803.
5) Nucleus is discovered by
= Ernest Rutherford discovered the nucleus of the atom in 1911.
hope this helps you.
HELP QUICK An unknown substance is a liquid and is red in color.
How can you determine if the unknown is a mixture or a pure substance?
How to calculate the frequency of a wave?
Answer:
count each wave crest
Explanation:
hope this helps
Which condition must be met for conduction to occur?
A:particles must be large
B:articles must be small
C:particles must be in contact
D:particles must be spread apart
Answer:
D
Explanation:
when you boil water in a pot and put a lid or something meatal over it when it reaches a certain temperature it gets steamy and during that it will get hyper and run around in circles and will go up but since the meatal or glass lid is there it will stop it and you will see water droplets on the inside.
Answer:
d
Explanation:
WILL MARK AS BRAINLIEST IF CORRECT
Answer:
B because if it's adding more atoms but becoming more compact then it is getting smaller.
Explanation:
All living organisms do cellular respiration and give off carbon dioxide. TRUE OR FALSE
Answer:
false
Explanation:
All living things use cellular respiration to turn organic molecules into energy. Cellular respiration is the chemical process of breaking down food molecules in order to create energy in the form of adenosine triphosphate (ATP). ... This is called aerobic respiration.
Cellular respiration takes place in all living organism despite the level of organism and produces carbon dioxide and water.
What is cellular respiration?Cellular respiration is the process of breaking food or glucose by the action of biological catalysts to form carbon dioxide and water. This process goes through several stages including some electron transport chains
There are both aerobic and anaerobic respiration. Aerobic respiration takes place in the presence of oxygen whereas anaerobic respiration needs no oxygen.
Every living organism consume food and digest and from the food the cell makes energy by cellular respiration. Hence, the fact that all living organism do cellular respiration is true.
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imagine a basketball filled with liquid water. Would the basketball still hold the same number of molecules ? Can you use 22.4L/mol as the molar volume for liquid water?
Answer:
the ball will have more molocules
Explanation:
the ball has a heaveir mass
No, the basketball hold more number of molecules due to presence of water in it.
When the basket ball is filled with water so the empty spaces present between gas molecules also filled and increase occurs in the concentration of molecules.
We can't use 22.4L/mol as the molar volume for liquid water because it is a molar volume of ideal gas at STP and we know that liquid water is not a gas, it is a liquid so we can conclude that more molecules are present in the basket ball due to addition of liquid water.
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Explain how ions are accelerated, detected and have their abundance determined in a time of flight (TOF) mass spectrometer
Your own words
Answer:
mass spectrometers separate ions by time without the use of a magnetic field. All ions are accelerated by an electric field
Differentiate the particles in terms of location, charge, and relative
Explanation:
location:
charge: 89%
relative:t h e y r e f i n e , a n d so a n d t h e n
t h a n k s f o r t h e p o i n t s
A ball rolls down a ramp. It goes through a
straight tunnel, and then curves to the left.
Based on this information, which statement is
true about the ball's motion?
3. Which graph indicates that one of the runners started 10 meters ahead of the other?
A
B
30
Distance from starting line (meters)
Distance from starting line (meters)
2
1
2
Time seconds)
The seconds
с
D
Distance from starting line (meters)
Distance from starting line (meten
GE
1
2
Time (seconds)
The seconds)
A graph A
O B. graph B
O C. graph
O D. graph D
Answer:
A
Explanation:
I think, I hope it is correct
The substances which are not found in the periodic table are called ?
Answer:
undiscovered elements (by their atomic number).
(I don't know if this is the correct answer)
Explanation:
The letters “J” and “Q” are the only two letters not found on the periodic table. These letters do not occur in either element symbols or element names.
if our body is 60% made out of water why don't we evaporate?
Let's see it you guys can solve this!
Answer:
ok
Explanation:
Water has a high heat capacity, so it will be harder for the fire to evaporate it
Which option explains how some parts of a plant can be white?
Some parts of a plant can be white because they do not contain chlorophyll.
Chlorophyll is a term to refer to a characteristic compound of most plants that has the function of:
Bring the green color to vegetablesTake charge of the photosynthesis process.Some plants do not have as much chlorophyll in their systems. However, this does not affect their reproduction and growth because they have developed other feeding methods through their roots.
These plants that contain low amounts of chlorophyll have pale and white colorations because chlorophyll is what gives the plants their intense green color.
Note: This question is incomplete because options are missing. Nevertheless, I can answer it based on my prior knowledge.
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if the electron affinity for an element is a negative number, does it mean that the anion of the element is more stable than the neutral atom?
Answer: No
Explanation: It means that an electron in an atom or ion is lower in energy than a free electron.
No, the anion of the element is more stable than the neutral atom but an electron in an atom or ion is lower in energy than a free electron.
What is kinetic energy?Kinetic energy is defined as the energy of the object that occurs due to the motion of the object. The total work needed by the body to starts accelerating it by the help of given mass which is supplied from the rest position and its mentioned velocity.
The energy body gets due to the process of acceleration by this the body will able to main the kinetic energy of the body without changing the speed of the body. The energy which has been stored in the body or any object by the help of the particular position or the proper arrangement of the parts is known as potential energy.
There will be no effect of the outside environment on the potential energy that present inside the body. The kinetic energy decrease or increase with change into the velocity.
Therefore, No, the anion of the element is more stable than the neutral atom but an electron in an atom or ion is lower in energy than a free electron.
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Which low-energy state of condensed matter is characterized by structural rigidity and resistance to changes of shape or volume?
Solid is the low energy state of condensed matter is characterized by structural rigidity
Which two kingdoms are the only prokaryotes
Answer:
There are two kingdoms of prokaryotes. These are the bacteria (or eubacteria ) and the archaebacteria (or the Archaea ).
Explanation:
An empty beaker weighs 31.89 g.
When completely filled with water, the beaker and its contents have a total mass of 305.55 g. What volume does the beaker hold?
Use d = 1.00 g/mL as the density of water.
Explanation:
difference of masses - (305.55-3189)g = 273.66g
density of water = 1g/mL.
therefore, volume = m/density (ρ)
= 273.66/1 = 273.66mL.
so, the beaker can hold 273.66mL.
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this ionic compound is named incorrectly.
1. find and describe the mistake
2. correctly name the compound
CaCl² - Calcium Chlorine
CuS - Copper Sulfide
Li³P - Trilithium Phosphide
CuBr - Copper(II) Bromide
NaOH - Sodium Hydrogen Oxide
1. Ionic compounds are named using the cation and the anions in the compounds respectively.
The name of the cation remains thesame as it's element while the anions name changes by adding another suffix to the elements name.
Sometimes, the number of positive charge of a cation is added in front of it's name before adding the anion's name.
2. Correct names of the compounds above
CaCl² - Calcium chloride
CuS - Copper Sulphate
Li³P - Lithium Phosphide
CuBr - Copper (1) Bromine
NaOH - Sodium Hydroxide
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When naming a compound, which of these is written first?
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how many chromium (II) ions would bond with 2 phosphate ions?
Answer:
ummmm I don't know of sorry
A student needs to make 0.855 L of a sodium bromide solution for an experiment. The concentration of the required solution is 0.350 M. How many grams of sodium bromide will he need to use?
Answer:
Explanation:
Molarity = moles/liters of solution
moles = molarity x Liters of solution
= 0.350 m/L x 0.855 L
= 0.299 mol
mass = moles x molar mass
= 0.299 mol x 102.89 g/ms
= 30.78 grams
Is oxygen likely to gain or lose electrons when boding? EXPLAIN.
Answer:
yes covalent bonding is the scientific term for this. This is simply four elements in groups 15 16 and 17 to receive electrons than to lose them oxygen atoms, for example, acquired two electrons to create see you two ions. The electron configuration is similar to that of the noble gas Neon.
Question 1 of 10
What happens inside a closed car on a hot day?
A. The pressure inside the car increases.
B. The molecules of gas slow down.
C. The number of molecules increases.
D. The volume inside the car increases.
Answer:
Explanation:
What happens inside a closed car on a hot day?
A. The pressure inside the car increases.
B. The molecules of gas slow down.
C. The number of molecules increases.
D. The volume inside the car increases.
The sunlight in the closed car increases the temperature, which makes the air molecules move faster, hitting the interior walls and windows more rapidly and thus increasing the pressure.
The answer is A.
That is why you never leave car windows rolled up on a hot day with a young child or pet inside. They can get sick and possibly die from overheating.
Please give the answer
Answer:
A. The battery. D. The wind turbine. E. The solar panels
These give us electrical energy
There is a spelling error, I believe that is supposed to say stretched bow.
By stretching back a bow you are storing (Elastic) Potential Energy.
The transformation is (elastic) potential energy into kinetic energy (with some energy lost as sound and heat)
25 PT Which statement about exothermic reactions is true?
A.Electrons are transferred in an ionic bond.
B.Electrons are shared in an ionic bond.
C.Protons are transferred in an ionic bond.
D.Protons are shared in an ionic bond.
Answer: A
Explanation: electrons are transfers in iconic bonds they are completely transfers from one adam to another